Re: sched: Improve load balancing in the presence of idle CPUs
From: Jason Low
Date: Tue Apr 07 2015 - 19:28:36 EST
On Sat, 2015-04-04 at 15:29 +0530, Preeti U Murthy wrote:
> Solution 1: As exists in the mainline
> Solution 2: nohz_idle_balance(); rebalance_domains() on the ILB CPU
> Solution 3: Above patch.
> I observe that Solution 3 is not as aggressive in spreading load as
> Solution 2. With Solution 2, the load gets spread within the first 3-4
hmm, so 3-4 seconds still sounds like a long time.
> while with Solution3, the load gets spread within the first 6-7
> seconds. I think this is because, the above patch decides to further
> nohz_idle_load_balance() based on the load on the current ILB CPU which
> has most likely pulled just one task.
Okay, so perhaps we can also try continuing nohz load balancing if we
find that there are overloaded CPUs in the system.
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